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<title>Signing Your Applications</title>
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<P><FONT face=Courier>     
           
            
            
         
           The Android 
system requires that all installed applications be <FONT 
style="BACKGROUND-COLOR: #ffff00">digitally</FONT> signed 
with a <FONT style="BACKGROUND-COLOR: #ffff00">certificate</FONT> <FONT 
style="BACKGROUND-COLOR: #ffff00">whose private key <FONT color=#ff0000>is held</FONT>     by the application's 
developer</FONT>     
           
            
            
         
            
              
       
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The Android system uses the certificate as a means of identifying the author of 
an application and establishing trust relationships between 
applications.</FONT></P>
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       The certificate 
is not used to <FONT style="BACKGROUND-COLOR: #ffff00">control</FONT> <FONT color=#808080 size=1>(kiểm 
soát)</FONT>     
           
            
            
         
            
              
  which applications the user can 
install.</FONT></P>
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         The certificate does 
not need to be signed by a certificate authority: it is perfectly allowable, and 
typical, for Android applications to use self-signed 
certificates.</FONT></P></body>
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